It's about masturbation in part. "If I could tear you from the ceiling..." is actually literal; Young guys are known to put posters of hot girls on their ceilings over their beds to (masturbate, and then) fall asleep to. The narrator is simply wishing that his poster-girl is a real woman, because he is very attracted to her and convinced that if she were real he could give her all that she needs. Also note the "Please don't drive me blind." lyrics, as they refer to masturbation yet again, as the narrator pleads not to be alone in his efforts of affection and sexual desire.
It's about masturbation in part. "If I could tear you from the ceiling..." is actually literal; Young guys are known to put posters of hot girls on their ceilings over their beds to (masturbate, and then) fall asleep to. The narrator is simply wishing that his poster-girl is a real woman, because he is very attracted to her and convinced that if she were real he could give her all that she needs. Also note the "Please don't drive me blind." lyrics, as they refer to masturbation yet again, as the narrator pleads not to be alone in his efforts of affection and sexual desire.